Arizona Wildcats offensive lineman Zach Hemmila died in his sleep Sunday night, the school's athletic director, Greg Byrne, has announced.

Byrne said Hemmila "passed away in his sleep last night. We were notified this morning."

Rich Rodriguez said he didn't know any of the details about Hemmila's death.

Hemmila, 22, was from Chandler, Ariz. He was competing to start at center for the Wildcats.